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Misconception No. 5: NoSQL databases are for "Web scale" applications only; everything else uses ACID-compliant technology
Some people believe that only a niche subset of applications require scalable, distributed databases. If you stop and think
about it, how many developers today build online applications that don't keep "Web scale" in mind? It's like saying, "Only
a small number of cars require the speeds necessary for highway travel."
That may have been true when only a few highways existed, but now they are part of everyday travel. The same is true for Web-scale applications. Given the always-connected nature of endpoints -- whether they are users, devices, or sensors -- what other kind of online application would you write? When are performance and availability not a high priority?
Why it matters
Over a decade has passed since Eric Brewer presented his now famous Brewer's Conjecture, which laypeople ultimately learned
as the CAP theorem. It got us all thinking that the ability to scale out -- represented by "Partition tolerance" (the "P" in "CAP") -- might
be important enough to abandon something as sacrosanct as data consistency within an application. He was right. Today, two
attributes reign supreme for online applications: availability and performance. Without both, it's nearly impossible to satisfy
the insatiable flow of data and unyielding demands from users.
Eric Brewer has continued to refine his understanding of the CAP theorem in light of new technologies. At the same time, developers, architects, and database administrators are advancing their understandings of such trade-offs. At least, they're realizing we don't live in a one-size-fits-all world and must employ the right technologies for the right job. Those who free their minds of relational misconceptions will harness the power and opportunity provided by this new world of diverse database technologies.
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This article, "DataStax CEO: Let's clear the air about NoSQL and ACID," was originally published at InfoWorld.com. For the latest business technology news, follow InfoWorld.com on Twitter.